Optical fiber-based wireless systems and related components and methods are disclosed. The systems support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system (IDAS) to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). In one embodiment, calibration of communication downlinks and communication uplinks is performed to compensate for signal strength losses in the system.

Optical fiber-based distributed antenna systems, components, and related methods for calibration thereof

A system, and related methods and devices, is disclosed for increasing an output power of a frequency band in a distributed antenna system that includes at least one RXU module that is operatively coupled to at least one RAU module. A first group of the plurality of channels within a first frequency band may be allocated to the RAU module, and a second group of the plurality of the channels within the first frequency band may be allocated to the RXU module. The at least one RAU module may be configured to receive RF signals from the first group of the plurality of channels being used in the first frequency band, and the at least one RXU module may be configured to receive RF signals from the second group of the plurality of channels being used in the first frequency band. In this manner, the amount of composite power per channel is increased.

Systems, methods, and devices for increasing radio frequency (RF) power in distributed antenna systems

Distributed communications systems providing and supporting radio frequency (RF) communication services and digital data services, and related components and methods are disclosed. The RF communication services can be distributed over optical fiber to client devices, such as remote units for example. Power can also be distributed over electrical medium that is provided to distribute digital data services, if desired, to provide power to remote communications devices and/or client devices coupled to the remote communications devices for operation. In this manner, as an example, the same electrical medium used to transport digital data signals in the distributed antenna system can also be employed to provide power to the remote communications devices and/or client devices coupled to the remote communications devices. Power may be injected and switched from two or more power sources over selected electrical medium to distribute power for power-consuming components supporting RF communications services and digital data services.

Providing digital data services as electrical signals and radio-frequency (RF) communications over optical fiber in distributed communications systems, and related components and methods

What would it take to reduce speed binning's dependency on functional testing? One answer is a structural at-speed test approach that can achieve the same effectiveness as functional testing. The authors of this article offer a formula to relate structural critical-path testing frequency to system operation frequency. They demonstrate that there can be a high correlation between frequencies resulting from structural testing and those resulting from functional testing.

Speed binning with path delay test in 150-nm technology

Optical fiber-based wireless systems and related components and methods are disclosed. The systems support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system (IDAS) to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). A microprocessor-based control system or systems may also be employed. The control systems may include one or more microprocessors or microcontrollers in one or more of the components of the system that execute software instructions to control the various components and provide various features for the optical fiber-based distributed antenna systems.

Optical fiber-based distributed antenna systems, components, and related methods for monitoring and configuring thereof

PROBLEM TO BE SOLVED: To provide a common radio communication apparatus which stores many terminal systems having various kinds of radio communication systems. SOLUTION: The apparatus has a first storage portion which stores a digital signal digital-converted in such a state that a radio signal sent out of a first communication apparatus is not demodulated, a demodulation system selecting portion which selects and demodulates a modulation-demodulation system for demodulating the digital signal to be stored in the first storage portion, a second storage portion which stores the digital signal demodulated by the demodulation system selecting portion, and data transmitter which reads the digital signal stored in the second storage portion, extracts data requested from the read digital signal and transmits it to a second communication apparatus when a transmission request of the data to be transmitted from the second communication apparatus is brought. COPYRIGHT: (C)2008,JPO&INPIT

Radio communication apparatus, radio communication system, digital radio-over-fiber communication method and program

In this paper, we propose an efficient path selection method for path delay testing. The proposed method selects a very small set of paths for delay testing that covers all paths. Path selection is done by judging which of two paths has the larger real delay by taking into account the ambiguity of calculated delay, caused by imprecise delay modeling as well as process disturbance. In order to make precise judgement under this ambiguity, the delays of only unshared segments between the two paths are evaluated. This is because the shared segments are presumed to have the same real delays on both paths. Experimental results show the method can select about one percent of the paths selected by a conventional method without decreasing fault coverage.

Efficient path selection for delay testing based on partial path evaluation

PROBLEM TO BE SOLVED: To achieve the efficiency of mechanical learning and the highly precise construction of a model by introducing preliminary knowledge relating to a sensor to a process for learning a normal model from the observed value of each sensor on a sensor network. SOLUTION: A model learning device 300 receives data of the observed value of each sensor installed in a sensor network 100 from an observed value database 200, and calculates the master sensor group of each sensor from the observed data and preliminarily knowledge relating to the sensor acquired from a preliminary knowledge database 600, and calculates the statistical parameter of the sensor observed value based on the dependency of the calculated sensor and the master sensor group, and transmits it to a unique pattern detection device 400. The unique pattern detection device 400 receives an observation pattern as observation data at each observation time as the object of unique pattern detection from the data base 200 of the observed value, and decides the uniqueness of the received observation pattern by using the information of the master sensor group and the statistical parameter, and detects an abnormality. COPYRIGHT: (C)2009,JPO&INPIT

Unique pattern detection system, model learning device, unique pattern detector method, and computer program

A Ubiquitous wireless network architecture and its impact on optical networks

In this paper, we introduce a way of modeling the differences between the calculated delays and the real delays, and propose an efficient path selection method for path delay testing based on the model. Path selection is done by judging which of two paths has the larger real delay by taking into account the ambiguity of calculated delay, caused by imprecise delay modeling as well as process disturbances. In order to make precise judgment under this ambiguity, the delays of only the unshared segments of the two paths are evaluated. This is because the shared segments are presumed to have the same real delays on both paths.

The experiments used the delays of gates and interconnects, which were calculated from the layout data of ISCAS85 benchmark circuits using a real cell library. Experimental results show the method selects only about one percent of the paths selected by the most popular method.

Efficient Path Selection for Delay Testing Based on Path Clustering

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Mitsuo Teramoto

Author Tools

Chat about Author